Yeah,
I think your boas probably won't ever bite you unless you make a grave error.
Retics are great, busy and fun but require a bit of extra care and work. Not rocket science, but for some they are too much. Some folks like lap dog snakes. I certainly am one of them, but I like to have some action too.
Wallace has been staring me down since I took the shed out so he's ramping up for dinner I'm sure.
Sniper was pushing (my boa) hard for a while. I used the same method JM mentioned, although modified for my cage. It worked. He didn't feel the little area where air was coming through, and the was really no gap so he gave up.
Keep us posted.